Real name: Karl Hugo Ljungström

Swedish national fiddler, local and folk music researcher and railcar engineer, born January 1, 1920 in Ljusdal parish, grew up in Hybo outside Ljusdal, died May 8, 2008 in Bollnäs, Hälsingland.

At the age of eight, Ljungström received his first violin, which was bought by mail order, but after a couple of years he was considered so good that he had done the right thing for a better violin that was paid for by selling the family's pig. After a period as a rail bus driver in Östersund, he moved to Bollnäs and became increasingly involved in making music and local and folk music research. Ljungström was for a long time a member of Bollnäsbygden's fiddlers' association, as well as of the Visarkivet's recording council as well as secretary of Hälsingland's fiddlers' association and auditor of the Swedish fiddlers' national association.

During all these years, Ljungström had a burning interest in Hälsingland's folk music and began as a child to collect newspaper clippings and sheet music. After retiring from the railway in 1979, his research became more intensive and it resulted in around 1,700 photographs, 100 books with newspaper clippings and 200 cassettes with music recordings. He thus contributed to increased knowledge about Hälsingland's folk music and its survival. Everything is collected at the Folk Music Archive in Ljusdal. He has also on several occasions participated in radio, including together with Mauritz Callmyr and Ulf Störling.

Ljungström has been rewarded many times for his work as a folk music researcher, e.g. In 2000, he received the Gustav Adolf Academy for Swedish folk culture scholarship.